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#include "headers.h"
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static char *hmsg = "headers";
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int nbudphdrsize;
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char *
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nbudpannounce(ushort port, int *fdp)
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{
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	int data, ctl;
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	char dir[64], datafile[64+6], addr[NETPATHLEN];
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	snprint(addr, sizeof(addr), "udp!*!%d", port);
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	/* get a udp port */
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	ctl = announce(addr, dir);
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	if(ctl < 0)
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		return "can't announce on port";
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	snprint(datafile, sizeof(datafile), "%s/data", dir);
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	/* turn on header style interface */
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	nbudphdrsize = Udphdrsize;
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	if (write(ctl, hmsg, strlen(hmsg)) != strlen(hmsg))
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		return "failed to turn on headers";
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	data = open(datafile, ORDWR);
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	if (data < 0) {
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		close(ctl);
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		return "failed to open data file";
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	}
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	close(ctl);
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	*fdp = data;
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	return nil;
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}